Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1998-11-19
2000-01-04
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330271, H03F 326
Patent
active
06011438&
ABSTRACT:
A push-pull wideband semiconductor amplifier for use in, for example, a CATV (cable television) system. The amplifier suppresses deterioration of composite second-order (CSO) distortion in output signals. The push-pull wideband amplifier includes: a divider which divides a signal inputted by way of an input terminal into two signals of differing phase, first and second amplifying circuits each of which amplifies the signal divided by the divider, and a combiner which combines the two signals amplified by the first and second amplifying circuits into one signal and outputs the result signal. The node between the first amplifying circuit and the second amplifying circuit is an imaginary ground point having a potential of 0 V from the standpoint of an alternating-current signal. A termination circuit is provided between this imaginary ground, point and ground and absorbs fluctuation in potential generated at the imaginary ground point. In the event of fluctuation in potential generated at the imaginary ground point, the fluctuation in potential is absorbed by the termination circuit. The standing wave that accompanies fluctuation in potential is therefore not generated, and even-order distortion is suppressed.
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Fukasawa Yoshiaki
Kakuta Yuji
Taguchi Yuichi
NEC Corporation
Nguyen Khanh Van
Pascal Robert
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